Three of the four teams that reached the World Cup semifinals represent Western European societies struggling with immigration and integration. But the fourth and most surprising consists entirely of local boys from a tiny country. Croatia\u2019s success has different origins than that of its rivals: In that country, soccer is more than a game. It\u2019s fed a war, the nation-building that followed \u2014 and the post-victory comedown, which, perversely, may have led to its squad\u2019s stunning achievement. For a country with a population of 4.2 million, Croatia is spectacularly successful at sports. Besides soccer, it\u2019s got top flight teams in handball, water polo and basketball, and Croatian tennis players are part of the global elite. In part, this probably has to do with genetics: Croats (and their neighbors from Serbia and Bosnia) are among the tallest people in the world, and many are naturally athletic. There are thousands of sports clubs, most of them left over from former Yugoslavia\u2019s achievement-oriented sports project (although some locals worry that this infrastructure is dying off). Soccer, however, is a special case. A May 1990 riot at Zagreb\u2019s Maksimir Stadium that stopped a game between local Dinamo and Red Star from Belgrade was, to many Croatians, the beginning of the war that established their country as a separate state. The Serbian fans were led into the riot by Zeljko Raznatovic a.k.a. Arkan, the future war criminal; police, considered an instrument of the Serb-led Yugoslav state, intervened too late and focused on the hardcore Dinamo fans \u2014 the Bad Blue Boys, as they call themselves. A Dinamo player, Zvonimir Boban, got into the fight to help a fan. His act became a symbol of resistance to Croats. At another soccer game, between Hajduk Split and Partizan Belgrade, in September 1990, Hajduk\u2019s hardcore fans, the Torcida, burned the Yugoslav flag and chanted, \u201cCroatia \u2014 independent state.\u201d \u201cIf the Maksimir riots are interpreted as the \u2018day the war started,\u2019 then this game had to be termed as the \u2018day Yugoslavia stopped existing\u2019 (at least on sporting grounds) with the symbolic burning of the most meaningful national symbol which signaled a total lack of state legitimacy,\u201d wrote Dario Brentin of Graz University in Austria, who has studied the links between soccer and politics in the Balkans. Franjo Tudjman, the nationalist leader at the head of the independence drive, used the soccer fan organizations\u2019 radicalism to drive his message and soccer itself to acquire legitimacy for an increasingly independent Croatia. In October 1990, a game between a selection of Croat players and the U.S. national team was seen as the secessionists\u2019 major diplomatic success. Athletes, including soccer players, continued serving as Tudjman\u2019s informal ambassadors throughout the ensuing war. And once it was won (nationalist soccer fans, of course, had been among the first to volunteer), Tudjman \u2014 who proclaimed that \u201cafter war, sport is the first thing by which you can distinguish nations\u201d \u2014 continued attaching major importance to soccer. In 1998, when Croatia, unexpectedly for all but its diehard fans, won third place in the World Cup, Boban, the team captain and national hero, praised Tudjman as \u201cfather of all things we Croats love, also the father of our national team.\u201d Tudjman centralized soccer governance and sometimes would even interfere in coaching decisions; to him, soccer was a weapon and a tool for building a national identity for domestic consumption and for a world that wasn\u2019t particularly interested in distinguishing between \u201cformer Yugoslav\u201d states. Tudjman died in 1999, but his state-building project was successful enough eventually to get Croatia into the European Union (it acceded in 2013). Still, the country was and remains no stranger to post-Communist corruption, and in recent years, much of the Croatian soccer story has been about graft. In early June, Zdravko Mamic, former chief executive of Dinamo Zagreb and the unofficial boss of Croatian soccer, was sentenced to six and a half years in prison for diverting some $18 million from players\u2019 transfer fees. Dinamo sold its top players, including Luka Modric, the star of the current national team, through an agency run by Mamic and his brother. Mamic fled to Bosnia, which doesn\u2019t have an extradition treaty with Croatia. Modric is accused of perjuring himself during the Mamic trial, at which his testimony could have helped the soccer boss. Another Croatia star, Andrej Kramaric, refused to sign a contract like Modric\u2019s, according to which Mamic\u2019s agency would have been entitled to part of his transfer fees. The fans, who have waged a war in recent years to end corruption in Croatian soccer and get more of a say in how the clubs are run, again are at the forefront of a political battle \u2013 this time against Croatia\u2019s crony capitalism; to them Kramaric is a hero and Modric is a traitor. Indirectly, the corruption in Croatian soccer may have contributed to the current national team\u2019s strength. Almost all of its members play for elite European clubs; it\u2019s been in Croatian club bosses\u2019 interest to sell them off at the best price rather than to retain them, and the players ended up getting varied experience in Europe\u2019s top soccer leagues. Today, they are confident pros without any inferiority complexes linked to their country\u2019s size. It\u2019s unclear whether Croatia can be as strong when this generation of stars retires. The country\u2019s economy is suffering from years of mismanagement. With youth unemployment at 33 percent and the heavily indebted government too deeply involved in key industries, the country can hardly sustain the training system it inherited from socialist times. While soccer fans remain a political force, with all their nationalist warts and anti-capitalist pathos, the fervor of the 1990s no longer determines the political landscape. Yet that fervor appears to be back to some extent as the country celebrates the soccer team\u2019s victories. This may be the last war for a while that the national squad is winning, but the memories of the time when soccer was more than a game still live. That\u2019s why Croatian President Kolinda Grabar-Kitarovic is the only national leader at the World Cup to wear the national colors and make a convincing show of supporting the team rather than carrying out a diplomatic function. The Tudjman-era legacy, the realization that sometimes a sports team\u2019s performance may be existentially important for a nation, isn\u2019t quite gone. Croatia\u2019s success lies at the crossroads between professionalism forged in English, German, French, Italian and Spanish leagues and the fierce spirit of the 1990s. This is a combination that left England by the wayside and can be fearsome even to the seemingly unbeatable French squad in Sunday\u2019s final.