During the colonial period and until after the Second World War, many of the European immigrants to Venezuela came from the Canary Islands, which had a significant cultural impact on the cuisine and customs of Venezuela. These influences on Venezuela have led to the nation being called the 8th island of the Canaries. With the start of oil exploitation in the early 20th century, companies from the United States began establishing operations in Venezuela, bringing with them U.S. citizens. Later, during and after the war, new waves of immigrants from other parts of Europe, the Middle East, and China began; many were encouraged by government-established immigration programs and lenient immigration policies. During the 20th century, Venezuela, along with the rest of Latin America, received millions of immigrants from Europe. This was especially true post-World War II, as a consequence of war-ridden Europe. During the 1970s, while experiencing an oil-export boom, Venezuela received millions of immigrants from Ecuador, Colombia, and the Dominican Republic. Due to the belief that this immigration influx depressed wages, some Venezuelans opposed European immigration. The Venezuelan government, however, were actively recruiting immigrants from Eastern Europe to fill a need for engineers. Millions of Colombians, as well as Middle Eastern and Haitian populations would continue immigrating to Venezuela into the early 21st century.