The statement that best expresses the central idea of the excerpt is that many people migrated to America from Europe.
What is a central idea?
A part of information or content in a literary composition, which is the point of focus of the entire text, is known as the central idea of the given passage.
In the given passage, the migration of Europeans in America in the years during the nineteenth and twentieth century is the central idea of the excerpt.
Hence, option D holds true regarding central idea.
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