Europeans colonized North America for several key reasons: 1) Prejudice - European colonists viewed indigenous people as inferior and did not understand resistance to change. 2) Slavery - The slave trade brought thousands of Africans to work plantations, and many Europeans believed slavery was acceptable. 3) Economic factors - The "triangle trade" routed goods and slaves between West Africa, the Caribbean/American colonies, and Britain for mutual economic benefit, especially through the slave trade.