There is no reason to enslave Americans. Why? Americans are the world’s most prolific consumers and for the most part docile to a fault. In today’s society hurting someone’s feelings often brings greater consequences than armed robbery.
Freedom should not be taken for granted however. Your freedom depends upon you maintaining your propensity to spend. Notice what happens when Americans show signs of spending less. A law is passed to force them to buy products or services. Or, interest rates are kept so low that no return on savings is possible. The best option then is to spend since rates are so low. Borrowing and spending seem reasonable. War is another option.
Americans are safe from slavery as long as they are valued highly as consumers. If consumer spending declines watch out because your value as a slave increases relative to your value as a consumer.