<span>Total federal revenues doubled from just over $517 billion in 1980 to more than $1 trillion in 1990. In constant inflation-adjusted dollars, this was a 28 percent increase in revenue.3As a percentage of the gross domestic product (GDP), federal revenues declined only slightly from 18.9 percent in 1980 to 18 percent in 1990.4<span>Revenues from individual income taxes climbed from just over $244 billion in 1980 to nearly $467 billion in 1990.5 In inflation-adjusted dollars, this amounts to a 25 percent increase.</span></span>
The Sumerians were probably the first to write down their beliefs, which were the inspiration for much of later Mesopotamian mythology, religion, and astrology. Sumerians believed that the universe consisted of a flat disk enclosed by a tin dome.
There are many important contributions of ancient Rome to modern western civilization, but perhaps the best option from this list is "A. <span>network of long-distance paved roads"</span>
