Question

us defense spending (1948–1968)
in which two years shown on the graph did us defense spending peak?
1953 and 1968
what did the united states spend on defense by the end of the 1960s?
about $420,000,000
about $4,200,000,000
about $420,000,000,000

Explanation:

First Question (Peak Years)

To determine the peak years of US defense spending from the graph, we analyze the height of the graph's line. The line reaches higher points around 1953 and 1968 compared to other years. So these are the peak years.

The y - axis of the graph is labeled "Billions of Yr. 2000 Dollars". At the end of the 1960s (around 1968), the graph shows the defense spending is around 420 billion (in year 2000 dollars). Among the options, "about $420,000,000,000" (which is 420 billion) matches the scale of the graph. The other options are either too small (in the millions range) and do not match the "billions" scale of the y - axis.

Answer:

1953 and 1968

Second Question (Defense Spending by End of 1960s)