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It was in pursuit of such trade routes the Columbus "discovered" the New World.
they lead the crusades yes. The crusades were an effort to retake Jerusalem.
each crusade was lead by a different person
experiments with cathode rays lead to the discovery of the Electron.
Christopher Columbus is an Italian who was born in 1451. In 1492 he made a voyage which lead to his discovery of the Americas, although he thought he had actually landed in India. This is why he called the local people he discovered "Indians".
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Queen Isabella funded Christopher Columbus' voyage, which lead to his discovery of the North and South American continents. She also funded many other voyages and colony formations, which lead to the Spanish control of much of Central and South America.
much information lost in antiquity was kept by the Arabs, the crusades gave Christian Europe access to this data.
It caused more Africans to be enslaved for work