Seeing how the Great Depression was long gone since 1939, A would be incorrect, and World War Two started in 1939(US entered the war in 1941) so B would make no sense either. The integration problem happened in the 60's so that would be incorrect as well, using the process of elimination the correct answer would be D) The United States and the Soviet Union had been involved in the Cold War for about four decades.
The Vikings called America Vinland,discovered by Lief Erikson
Answer: b.a categorical variable.
Explanation:
In numerical variables, such as rainfall measured in inches or the number of sales in a day, the numbers have a numerical meaning. But a categorical variable is a category such as gender and national origin. It can be represented as a number, like the Social security number, but the numbers won´t have a numerical value. If your SSN is bigger than mine, it doesn´t mean that you are greater or at a different level on a scale, because the numbers are used as categories, not as mathematically meaningful.
Well Rome conquered many countries and people but the first ones were probably the Carthaginians. It could also be the Jewish, Germanic tribes, Celtics, etc.
