the biggest issues were political and economic and Germany resentment over the harsh terms imposed by the Versailles treaty this would lead germany to be lead by Adolf Hitler and start world war2
You can get this from ballotpedia
The best and most correct answer among the choices provided by the question is the fourth choice "Spain"
<span>New Imperialism or Neo-imperialism was a period of colonial expansion by European powers, the United States of America, and the Empire of Japan during the late 19th and early 20th centuries.</span>
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"<span>c. hundreds of Indian peoples, tribes, languages, and ways of life" would be the best option from the list, since the native population of the United States was incredibly diverse.</span>
The answer for the 1st one is the Romans