A large number of germans immigrated to the united states because:

In the decade from 1845 to 1855, more than a million Germans fled to the United States to escape economic hardship.

Step-by-Step explanation:

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In the decade from 1845 to 1855, more than a million Germans fled to the United States to escape economic hardship. They also sought to escape the political unrest caused by riots, rebellion and eventually a revolution in 1848.