How did social darwinism start the new imperialism in the 19th century

the dominoes began to fall. the surrender at appomattox took place a week later on april 9. while it was the most significant surrender to take place during the civil war, gen. robert e. lee, the confederacy's most respected commander, surrendered only his army of northern virginia to union gen. ulysses s. grant

explanation:

the main objectives of the progressive movement were eliminating problems caused by industrialization, urbanization, immigration, and political corruption.