The Spanish were in search of gold and other riches.
Because of the super rich in protean soil. ~Matya
<span>- to produce more of certain goods and services in a more efficient way
- to trade with one another for goods or services they cannot provide on their own
- to produce more goods and services, and to contribute to greater global prosperity
In regard to goods or services a country cannot provide on its own, it may also simply be that it cannot provide those goods or services with the same degree of efficiency or quality as can another country. This is the idea of comparative advantage, where each country focuses on producing those things in which it has an advantage over others and then trade with others for the other goods or services it desires. On the global scale, this does increase productivity and prosperity overall.
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The Open Door policy—first initiated in 1899, with a follow-up missive in 1900—was significant in its attempt by the United States to establish an international protocol of equal privileges for all countries trading with China and to support China's territorial and administrative integrity.
Hope this helped:)