Children of illegal Haitian immigrants are often stateless and they are denied services, as their parents are denied Dominican nationality, and therefore are considered transient residents, due to their illegal status and undocumented, and children often have to choose only Haitian nationality. A large number of Haitian women, often arriving with several health problems, cross the border to Dominican soil during their last weeks of pregnancy to obtain necessary medical care for childbirth, since Dominican public hospitals cannot deny medical services based on nationality or legal status. Statistics from a hospital in Santo Domingo report that over 22% of births are to Haitian mothers. History During the wars with Haiti (1844–56), the government of this country developed a black centrism, a centrism that Dominicans strongly refused in favor of their Hispanic heritage. Historically, Haiti was more densely populated than the Dominican Republic. Due to the lack of free lands in Haiti, as land was held by a small group of landlords, Haitian peasants began to settle in the borderland region, within the Dominican Republic. Through the years, especially after 1899, the Haitian government claimed the territory populated by Haitians, and under a treaty in 1929 several towns and cities in Central Hispaniola officially became Haitian, comprising 4,572 km2. A Dominican census in 1935 revealed that 3.6% of the population was Haitian. In 1936, the Haitian government claimed more territory and the Dominican Republic ceded another 1,628 km2 to Haiti; the next year, the Dominican dictatorship ordered the Dominicanization of the border () and conducted the Parsley Massacre. In 1937, Trujillo, in an event known as the Masacre del Perejil (Parsley Massacre), ordered the Army to kill Haitians living on the border. The Army killed about 10,000 to 15,000 Haitians over six days, from the night of 2 October 1937, to 8 October 1937. To avoid leaving evidence of the Army's involvement, the soldiers used machetes instead of bullets. The soldiers of Trujillo interrogated anyone with dark skin, using the shibboleth "parsley" to differentiate Haitians from Afro-Dominicans when necessary, the "r" of parsley was difficult pronunciation for Haitians. As a result of the slaughter, the Dominican Republic agreed pay to Haiti the amount of $750,000, later reduced to $525,000. The genocide sought to be justified on the pretext of fearing infiltration, but was actually also a retaliation, commented on both in national currencies, as well as having been informed by the