Why did North American planters increasingly rely on slave labor rather than indentured servitude?

Because this labor was cheap and affordable

Many landowners also felt threatened by newly freed servants demand for land. The colonial elite realized the problems of indentured servitude. Landowners turned to African slaves as a more profitable and ever-renewable source of labor and the shift from indentured servants to racial slavery had begun.

Explanation:

Indentured servitude differed from slavery in that it was a form of debt bondage, meaning it was an agreed upon term of unpaid labor that usually paid off the costs of the servant's immigration to America. Indentured servants were not paid wages but they were generally housed, clothed, and fed.

Pachacutec fue el primer gobernante del imperio incaico. Fue él quien inició el gran expansionismo por el norte y sur. Creó alianzas que le permitieron dominar el territorio sin usar la fuerza. Llegó a conquistar el territorio de Perú, Ecuador y Bolivia así como la mitad de Chile y parte de Argentina y Colombia.