I believe the answer is the second option.
Answer:
These diseases wiped out many of the Indigenous people who lived in the Americas. They had never been exposed to these and were very weak against them. However, Africans had already been exposed to Europeans years prior. They have built up resistance to these diseases. So, Europeans began to ship out Africans to the Americas because they could work and not fall susceptible to European diseases like the Indigenous did.
The correct answer is D. Barbed wire allowed farmers to enclose their lands.
Explanation
The great plains are a region of the United States in which different economic activities have been carried out, among which agriculture and cattle raising stand out. However, this relationship was mediated by the disagreement felt by ranchers towards farmers who increasingly covered more areas of this region. For this reason, ranchers broke into the land of farmers and damaged their crops or attacked against farmers lives, for this reason, one of the farmers, tired of this situation, took as inspiration the use that was given to some bushes with thorns that were used as a barrier to prevent entry to private land and created barbed wire to prevent ranchers from entering farmers' land. With this invention, farmers began to fence off their land and limited the enter of ranchers who infiltrated to attack the crops and their owners. According to the above, the correct answer is D. Barbed wire allowed farmers to enclose their lands.
Answer:
Egypt had lots of natural barriers like the desert and the sea. It was a struggle for invaders.
Explanation:
