In general, an economic recession refers to when a country or state is undergoing a period of slow economic growth (sometimes the growth is negative). It is less severe than a depression.
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Explanation:
Natural fortifications also helps defend a country. For example the Alps in Italy defends them very well. Rivers can also be a defensive position a country can fall back to. So no, fortifications and defenses arent the only thing. Nature is able to help too.
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to ensure higher quality people
<em>The British and their colonies were able to trade without exchanging gold or silver, and the ships' owners (who were British) were able to make a profit at every leg of the journey. </em>
<em>Hope I helped. :) </em>
The supporters you're referring to were called patrons. Patrons were usually wealthy merchants or people who have made their fortune in other ways and wanted to either have a picture of themselves and their family, or generally had a desire to support painting, some even decided to order paintings for the church in order to get in good standing with the church officials.