President Lincoln waited for a Union victory before announcing the Emancipation Proclamation because the Union needed to show a victorious country defending the slaves in the Confederacy. If the Union didn't have a victory, the slaves would feel left out by the states that tried to save them.
Either they don’t want to pay them or the unemployed people don’t have the necessary things to do the job
Under Article II of the Constitution, the President is responsible for the execution and enforcement of the laws created by Congress. ... The Executive Branch conducts diplomacy with other nations, and the President has the power to negotiate and sign treaties, which also must be ratified by two-thirds of the Senate.