Which of the following were effects of Thomas Pinckney's Treaty with Spain? Select all that apply. The United States would be protected by Spain if a conflict with England arose. It granted the United States access to both the Mississippi River and the Port of New Orleans. It fixed the boundary between the United States and West Florida at the thirty-first parallel. It guaranteed navigation rights on the Mississippi to American citizens. It made New Orleans a "port of deposit", eliminating duties on the transfer of American goods.