why was it critical for good pioneer trails going west to have a decent route through the Rocky mountains

Which act of the conquistador pizarro was crucial in overthrowing the inca? a. the destruction of the ancient inca city, machu picchu b. the siege of the inca capital near the cuzco valley c. the execution of the last inca ruler, atahualpa d. the unexpected deaths of 3 million inca warriors e. the murder of former inca emperor, huascar

When was the us construction written

What were the effects of the great reform act of 1832?