Answer:
Due to lack of technology.
Explanation:
It took several centuries before the civilizations of the two hemispheres had communication because of lack of technologies that can make a bridge of communication between two hemisphere. People are not interested in research and having old wrong beliefs that prevent them from growth and development but due to renaissance movement people get rid of false and wrong beliefs and work for the advancement of technology which leads to communication between two hemisphere.
The capital of Texas is Austin :)
I believe the Project Mercury was the first program that first sent two people into Orbit.
It was the Soviet Union that put the two people to explore the Orbit.
Westerlies blow west to east picking up warmth from this current and carry it to Europe. There aren't any (large) mountain ranges that can block the winds so they are felt far inland. They carry moisture giving their region rainfall.
