Answer:
Celtic people
Explanation:
When the Romans arrived in Britain and conquered big portion of it, they encountered the Celtic people. The Romans were very familiar with the Celtic people, as they lived in northern Italy, as well as most of Western Europe. The Celtic people in Britain had multiple similarities with the continental Celts, but also had their own unique traits, both physical and cultural. While the Celtic tribes were the dominant force in Britain, it has to be mentioned that there were also lot of Native British people, or rather big portion of them had accepted the Celtic culture. In the northern part of the island though, there were the Picts (still people of unknown origin) which were never conquered and were the reason for the building of Hadrian Wall.
This question can refer to numerous wars. Here is a list of different wars you may be referring to:
1) World War I- The US abandon the policy of neutrality for multiple reasons. One of them was the German's use of unrestricted submarine warfare on ships containing American goods and citizens. The German's sank a British passenger ship, the Lusitania, that contained over 100 American citizens. These citizens were killed in this attack. Along with this, the United States also learned about Germany's attempt to make a secret alliance with Mexico in which Mexico would invade the US to prevent them from helping the Allied Powers. The US found out about this through the interception of the Zimmerman Telegram by the British. These two factors caused America to enter World War I.
2) World War II- The United States entered World War II after the Japanese military bombed the US military base called Pearl Harbor in Hawaii.
