I believe the answer is C.
The entry of the US into WWI really boosted the Allied Powers' morale, while destroying the morale of the Central Powers.
While the rest of the Allies had been fighting for nearly four years at this point, when the US entered, they were fresh, energized, and idealistic.
Basically, US soldiers encouraged the other Allies and helped them get their mojo back.
It was the first step to England's more democratic government.
It reinforced segregation and discrimination
The reason why Great Britain and France declared war on Germany at the beginning of the second World war was because A - The invasion of Poland.
When Germany invaded Poland this was the beginning of what would later be called the second World war. A tense atmosphere was brewing up in Europe for a few years since then already because when Hitler's party took charge of Germany, it increasingly militarized the country and was preparing it for war.
Answer:
The United Nations! The United Nations is an international organization founded in the year of 1945 after the Second World War by sveral countries committed to maintaining international peace and<u> security</u> , developing friendly relations among nations,countries and regions and promoting better living standards and human rights. The UN would definetly respond to such a conflict!!! Its their sole purpose to KEEP Peace or to help nations in wartime, And more!!!