[lentulusgracchus]

In fact, in convention, when George mason suggested a "Bill of Rights," every state voted against him.

That's because a tiny minority of the convention delegates were Antifederalists.

The need for amendment became obvious later, even to some of the Federalists (Nationalists)......which means that it was the Federalists who blinked and split, not the Antifederalists, on the issue of a Bill of Rights.

[justshutupandtakeit]

No, the Federalists promised that they would add one, even though they saw no need for it, in order to disarm their opposition and get the Constitution ratified.