Answer:
A. Ended the warring states period
<u>The Article of confederation</u> was the first American Constitution that included 13 states which was completed in 1777 and adopted in 1781 but later replaced by the constitution of the United States in 1789.
<u>Ratification</u> is the confirmation of a previous and unauthorised Act, that may has an effect of placing the Act in the similar position as if it had been initially authorised.For example, in the United States,proposed amendments in the U.S constitution must undergo convection in 3-quarter of the states.
<u>The Full Faith and Credit </u>Clause is the first sentence of the Article IV,section 1 of the U.S Constitution where states are granted the public Acts,Records and judicial proceedings of every other states.It ensures that the states are common,legal equal in union and respect/honor the law orders given by other state government.
<u> The Shay's Rebellion </u>of 1786 were several attacks on government properties and courthouses in Massachusetts that resulted into military confrontation in 1787.One of the major outcome of the event was the formation of a strong central government.
The correct answer is the Gadsden Purchase.
The Gadsden Purchase, which was necessary for the trans-contintental railroad, adding the final bit of the US/Mexico border.
