Answer:
A is the correct answer
Explain:
You can easily rule out D because there are still conflicts to this day. Now you have it easier to get the right answer. WW2 was the first truly modern war, in the civil war and evem WW1 they still waited to see the whites of peoples eyes before they fired. And the majority of the battles were actually fought in the north.
A.
Because the domino theory says<span> if one country in a region came under the influence of communism, then the surrounding countries would follow in a </span>domino<span> effect.</span>
D. the federal government pass strict laws related to Union formation and activities
C. The number of identured servants increased, while slavery decreased.
New technologies can help us because we are far more advanced now and we can study and comprehend further back in time and see how thing we’re and dig deeper and find prehistoric fossils and bones and study then more and more. And also technology helps us study the ocean more because as of right now we only know about %1 of the ocean and we can go deeper in the ocean and learn more about animals