Several reasons.
First was distance. Taking the southern route required sailing south in the Atlantic to clear either Africa or South America, then sailing north to the spice, and silk markets, then back again. A Northwest passage could cut that distance in half.
Associated with distance was risk. The more time spent at sea, the greater the exposure to storms, piracy, disease, ship maintenance issues, and unhappy sailors who occasionally mutinied.
Politics was an issue, too. The Dutch had established a presence on the African Route, and the Spanish were trying to dominate South America and its ports.
England, France, and Russia, major powers of the time were coming late to the party and really trying to find an edge.
Schools vary greatly in size, within countries and between countries. Schools vary greatly in size, within countries and between countries. Schools vary greatly in size, within countries and between countries. Schools vary greatly in size, within countries and between countries.
A scanning electron microscope produces greatly magnified images of surface detail. It functions by scanning a sample with a focused ray of electrons.
Iran
The native population of what is now Argentina, and the Spanish.
Not all countries have legislation for working hours.Those that do vary greatly.
Using the Internet in developing countries is greatly hampered by the high degree of poverty in developing countries. Not many people can access the Internet because it is expensive.
The Enlightenment valued reason and questioned the power of monarchs. The proliferation of Enlightenment ideals greatly influenced the creation of the United States.
The architecture in Africa varies greatly across the many countries, cultures, climates and terrain.
Haiti
civil wars in which South Africa and other countries became involved
The average income of a country depends with the country in question. The average income of the first world countries greatly varies when compared with those of the developing countries.
Laser eye surgery in the us is greatly reduced than in other countries do to sterilization techniques. in other countries the chemicals, such as ethinol are not widely available.