Immigration is the act of coming to a foreign country to live. Leaving one's country to settle in another is called immigration. Immigrants flee their countries because of persecution, war, disasters, famines, and epidemics. Some forsake their homeland seeking adventure, avoiding unbearable family situations and to reunite with loved ones. They also seeks better jobs, better economic security and to get away from religious persecution.
Professional people emigrate because of better opportunities.
Most people find it difficult to move from their native land to a strange country, but throughout history millions have done so. The heaviest immigration worldwide took place from the early 1800's to the Great Depression. Most come from Europe and more than half emigrated to the United States. We know that the United States is not made up of a single people. People from all continents came to America, and they forged this nation and then made it their own.