Answer:
<em>The</em><em> </em><em>event</em><em> </em><em>which</em><em> </em><em>caused</em><em> </em><em>an</em><em> </em><em>American</em><em> </em><em>declaration</em><em> </em><em>of</em><em> </em><em>war</em><em> </em><em>against</em><em> </em><em>Spain</em><em> </em><em>was </em><em>the</em><em> </em><em>explosion</em><em> </em><em>of</em><em> </em><em>the</em><em> </em><em>battleship</em><em> </em><em>maine.</em>
<span>Hitler wanted the Polish Corridor & the Port of Danzig</span>
White-collar workers than blue collar workers
A land between the rivers
While soviets rejoiced in the attainment of the sputnik system, Americans feared soviet advancements in science.
<h3>What advancements made Sputnik possible?</h3>
Sputnik made the possible to study the radio wave transmission and density of the atmosphere easy. He also supported the scientist to learn to track objects in orbit. He encourages testing satellite pressurization. This made pressure to America for advance of technology.
Thus, option A is correct.
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