3. Look at the graph’s 1959 totals. What does the 4.30 level indicate? What does the level of 4.60 indicate?
What does the level of 1.66 indicate?
By how much did the U. S. population increase in that year?

4. Nearly 60,000 more people immigrated to the United States in 1965 than in 1964.
Why then does the top line in the graph dip down between those years?

5. What is significant about the number of births in 1972? (Hint: Look at the number of births for the first year of the baby boom.)
Why do you think 1964 is considered the final year of the baby boom?

6. Contrast the patterns of births and deaths during the years 1940–1975.

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

the enslaved people onboard suffered from illness with some frequency

a

explanation:

just took the test

d) true or false question