verb
BAD : Some of those who can't find a job decide to immigrate.
GOOD : Some of those who can't find a job decide to emigrate.
BAD : We're planning to immigrate to the United States next year.
GOOD : We're planning to emigrate to the United States next year.
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The verb immigrate (= enter a foreign country and make your home there) is seldom used. Instead people tend to use immigrant and immigration (nouns): 'When jobs became scarce, the number of new immigrants suddenly decreased.' 'Immigration has decreased in recent years.'
emigrate = leave your own country and make your home in another one: 'His parents emigrated from Scotland to Canada in 1933.'