During the civil war, lincoln used his power as commander in chief to issue the which prohibited slavery in states under rebellion, as slave labor was an asset to the confederate army.

federal power is further limited with a system of checks and balances that gives each branch of government a measure of power over the others.

explanation:

the authority to tax.

in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate