Not all of North America. The last Ice Age's ice sheets spread all the way down to what is now the US/Canadian border, and that's about as far south as the ice went.
It carved the mountains and valleys and rivers and many lakes. The ice made most of the topography that exists today. Erosion gradually lessens the effect of the ice carving the land. It also killed most of the life here.
Nebraska and Iowa
no
Maybe...
The most recent ice age is known as the Last Glacial Period, which occurred approximately 110,000 to 12,000 years ago. This period was marked by extensive ice sheets covering large parts of North America, Europe, and Asia.
Maybe...
Yup!
Horses were brought to America by the conquistadors. Therefore they were not in North America during the ice age.
It helped them go from Asia to North America
none of these
Yes, Prehistoric horses became extinct in North America during the Ice Age. Recent research has suggested that their extinction was either climate related or human induced. The Spanish brought over horses to the America's in the 15th century - as can be reinforced by multiple indigenous American accounts of Spanish arrival.
The most recent ice age, called the Last Glacial Period, occurred between about 110,000 and 12,000 years ago. During this time, large ice sheets covered much of North America, Europe, and Asia, lowering global sea levels. This ice age also saw the emergence of modern human behavior and migration patterns.