The legal and historical scholars are still trying to sort out that question and it is still a topic of much interest among Civil War historians. A small consensus, especially coming out of the Southern Universites and Colleges (including my alma mater The Citadel) takes the view that the Constitution as it stood in 1860 did not prohibit Seccession. Certainly at the time it was the opinion of leaders, both in the North and the South, that the individual states did have the right to leave the Union. Of course the Constitution was ammended after the War of the Rebellion to prohibit seccession.
they decided to do the constitution
This shift was spurred on by the problems of the Great Depression.
William Patterson of New jersey proposed a legislative plan for the US Constitution. It was based on the one New Jersey had. This entailed the key element of having equal representation of the states in a one house legislature. This was identical to the plan in the Articles of Confederation. His idea was in response to an alternate idea called the Virginia Plan.
The Bill of Rights was enacted in response to fears that the Constitution did not do enough to protect the rights of individuals.
The Bill of Rights
The Texas Constitution of 1869 was written in response to Texas' declaration of independence. It was written by members of the Texas Republican Party.
The Lecompton Constitution was a proposed constitution for the state of Kansas written in response to the anti-slavery position of the 1855 Topeka Constitution. This enshrined slavery, protected the rights of slaveholders and allowed voters the choice of allowing more slaves to enter the territory.
Federalism is the political system that emphasizes a strong central government. In the United States, this movement was prominent in the 1700s, in response to the perceived lack of authority given to the federal government.
they decided to do the constitution
The only Constitutional Convention in US history was called in 1787. At the time, it was known as the Philadelphia Convention, because the delegates simply intended to revise the Articles of Confederation, not write an entirely new Constitution.
The Bill of Rights was added to the Constitution in response to Anti-Federalist fears that the new government would take away the liberties of the people and the states.
Washington's strong response to the Whiskey rebellion showed that the federal government was in charge , could and would enforce the laws passed by Congress, including the unpopular whiskey tax. The rapid put-down of the rebellion gained the presidency new respect and made similar rebellion more unlikely.