designed some of the most admired American skyscrapers during the 1950s and 1960s. architecture emphasized clean lines, geometric (usually rectilinear) form, and an avoidance of superficial decoration. The "bones" of a building were supposed to show and to be the only ornament necessary. a clasic example of this pure style is Lever House.

Louis Sullivan

The international style

Explanation:

Louis Sullivan designed some of the most admired American skyscrapers during the 1950s and 1960s. The international style architecture emphasized clean lines, geometric (usually rectilinear) form, and an avoidance of superficial decoration. The "bones" of a building were supposed to show and to be the only ornament necessary. a clasic example of this pure style is Lever House.

by 1890, the united states had by far the world's most productive economy. american industry produced twice as much as its closest competitor--britain. but the united states was not a great military or diplomatic power. its army numbered less than 30,000 troops, and its navy had only about 10,000 seamen. britain's army was five times the size of its american counterpart, and its navy was ten times bigger. the united states' military was small because the country was situated between two large oceans and was surrounded by weak or friendly nations. it faced no serious military threats and had little interest in asserting military power overseas.

the answer is b your welcome : )