How did the returning veterans of World War I and immigrants come into conflict?

The First World War brought an end to one of the biggest periods of immigration in American history. During the decade leading up to the war, an average of 1 million immigrants per year arrived in the United States, with about three-quarters of them entering through the Ellis Island immigration station in New York Harbor. The United States up to this point had an “open door” immigration policy, with no limit on the number of people who could enter the United States. Those arriving simply had to pass a medical and legal inspection to show that they would not pose a danger or burden to their new country — and 98% of those arriving at Ellis Island passed.

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A]They got along even better

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But not in all places the owners and the workers changed but only in few parts of the world.and in some places the workers were forced to do labour work in country.