Minnesota, and Wisconsin. The defeat of the repatriation initiative resulted in the reunifications in the US of many long-separated Hmong families. In 2006, as a reflection of the growth of the minority in the state, the Wisconsin State Elections Board translated state voting documents into the Hmong language. Throughout the Vietnam War, and for two decades following it, the US government stated that there was no "Secret War" in Laos and that the US was not engaged in air or ground combat operations in Laos. In the late 1990s, however, several US conservatives, led by Johns and others, alleged that the Clinton administration was using the denial of this covert war to justify a repatriation of Thailand-based Hmong war veterans to Laos. It persuaded the US government to acknowledge the Secret War (conducted mostly under President Richard Nixon) and to honor the Hmong and American veterans from the war. On May 15, 1997, in a total reversal of US policy, the federal government acknowledged that it had supported a prolonged air and ground campaign in Laos against the North Vietnamese Army and Vietcong. That day it dedicated the Laos Memorial on the grounds of Arlington National Cemetery in honor of the Hmong and other combat veterans from the Secret War. In 1999 there were about 250,000 Hmong people living in the United States, living in numerous medium and large cities. Some Hmong remained in refugee camps in Thailand at the time of the September 11, 2001, attacks. This resulted in the tightening of US immigration laws, especially under the Patriot Act and the Real ID Act, and the immigration of Hmong refugees to the US has significantly slowed. Most Hmong refugees in Thailand had been engaged in documented armed conflict (although under US sponsorship) during and after the Vietnam War. The anti-terrorism legislation created barriers to such people being accepted as immigrants. Demographics Hmong population in the US by areas of concentration According to the 2010 US Census, 260,073 people of Hmong descent reside in the United States up from 186,310 in 2000. The vast majority of the growth since 2000 was from natural increase, except for the admission of a final group of over 15,000 refugees in 2004 and 2005 from Wat Tham Krabok in Thailand. Of the 260,073 Hmong-Americans, 247,595 or 95.2% are Hmong alone, and the remaining 12,478 are mixed Hmong with some other ethnicity or race.