<span>(D) is the most correct answer. Pinckney's Treaty, also known as the Treaty of San Lorenzo, gave the US shipping rights on the Mississippi River and transport through New Orleans. The problem, at the time, was that even though the Mississippi River was under US control, the southern part was claimed by the Spanish. This led to a border dispute: Pinckney, then the minister to Great Britain, was the creator of the treaty that resolved this dispute in the late 1790s.</span>
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Native peoples of America had no immunity to the diseases that European explorers and colonists brought with them. Diseases such as smallpox, influenza, measles, and even chicken pox proved deadly to American Indians. Europeans were used to these diseases, but Indian people had no resistance to them.
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A new natural gas pipeline being built under the Baltic Sea from Russia directly to the German coast is shaking up geopolitics. Nord Stream 2, as it’s called, worries the bypassed countries in Eastern Europe, who fear losing transit fees, and is adding to friction with the U.S., which argues the link would give the Kremlin new leverage over Germany and other NATO allies. As the project nears completion, those trans-Atlantic tensions are building, with Donald Trump threatening to reduce the number of American troops in Germany partly because of the gas link.