Answer:
Through trade or auctions. Slaves were exported from Africa and imported to the Americas and Europe through the triangle trade.
Price changes send contrasting messages to consumers and producers about whether to enter or leave a market. Rising prices give a signal to consumers to reduce demand or withdraw from a market completely, and they give a signal to potential producers to enter a market.
The president can turn down proposed laws
A friend of mine insists that some of his friends were sent to war without adequate training, specifically only 2 weeks.