The Europeans increased the slave rate. after settling into the 13 colonies and earning the title 'colonists', the indentured servants(indentured servants are the poor people that signed a contract to pay for a trip to America, or if they were imprisioned) rebelled, and claimed that they were pushed into false promises of a new, better, life. The high class colonists decided that instead of free temporary help, they could pay once for a lifetime worth of slave labor. So, in conclusion, they increased slavery by a lot, creating a big ordeal.
