If the change is the Industrial Revolution:
transcontinental railroad: helped to transport goods and get across the country
US army: helped to protect the US and make sure no one is going to break the new amendments
Discovery of resources in western land: Allowed the US to be able to expand and people would be able to live, could also give the US more money
The answer is B solar power in Ireland
Answer:
Explanation: The question s incomplete, once you complete it i will answer for sure.
I believe the answer to be C. checks and balances
