There is also the National Puerto Rican Coalition in Washington, DC, the National Puerto Rican Forum, the Puerto Rican Family Institute, Boricua College, the Center for Puerto Rican Studies of the City University of New York at Hunter College, the Puerto Rican Legal Defense and Education Fund, the National Conference of Puerto Rican Women and the New York League of Puerto Rican Women, Inc., among others. The government of Puerto Rico has a long history of involvement with the stateside Puerto Rican community. In July 1930, Puerto Rico's Department of Labor established an employment service in New York City. The Migration Division (known as the "Commonwealth Office"), also part of Puerto Rico's Department of Labor, was created in 1948, and by the end of the 1950s, was operating in 115 cities and towns stateside. The strength of stateside Puerto Rican identity is fueled by a number of factors. These include the large circular migration between the island and the mainland United States, a long tradition of the government of Puerto Rico promoting its ties to those stateside, the continuing existence of racial-ethnic prejudice and discrimination in the United States, and high residential and school segregation. Notable attributes that set the stateside Puerto Rican population apart from the rest of the US Hispanic community, is facts such as, Puerto Ricans have the highest military enrollment rates compared to other Hispanics, Puerto Ricans are more likely to be proficient in English than any other Hispanic/Latino group, and Puerto Ricans are also more likely to intermarry other ethnic groups, and far more likely to intermarry or reproduce specifically with blacks than any other Hispanic/Latino group, especially African American males with Puerto Rican females. Since 1898, Puerto Rico has been under the control of the United States, fueling migratory patterns between the mainland and the island. Even during Spanish rule, Puerto Ricans settled in the US. However, it was not until the end of the Spanish–American War in 1898 that a significant influx of Puerto Rican workers to the US began. With its 1898 victory, the United States acquired Puerto Rico from Spain and has retained sovereignty since. The 1917 Jones–Shafroth Act made all Puerto Ricans US citizens, freeing them from immigration barriers. The massive migration of Puerto Ricans to the mainland United States was largest in the early and late 20th century, prior to its resurgence in the early 21st century. U.S. political and economic interventions in Puerto Rico created the conditions for emigration, "by concentrating wealth in the hands of US corporations and displacing workers."