Did the Emancipation Proclamation actually free the slaves?

For which two reasons did the iroquois confederacy eventually side with the british?

How was rockefeller able to build his monopoly across the oil industry? he found newer and cheaper ways to refine oil, increasing his profits. he confined his business to ohio so he could buy all the refineries there. he bought up oil refineries, cut costs, and reinvested his profits in other refineries. he began to sell kerosene as well as oil, expanding his market.

When top-roping is used, how long should the rope be in order to protect the climber throughout the climb?