According to the preamble, the phrase “a more perfect union” refers to

According to the preamble, the phrase “a more perfect Union” refers to improving upon a previous attempt at creating a new union.

The phrase “to form a more perfect Union” was stated to refer to the shift to the Constitution from the Articles of Confederation. The Union had a federal government established by the Constitution that had enough power to act upon citizens directly.

This is the preamble of the Constitution:

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.

The answer is: improving upon a previous attempt at creating a new union.

Explanation:

uncle sam would be tossing and turning in his grave : *)

the  equal rights amendment  (era) states: "equality  of  rights  under the law shall not be denied or abridged by the united states or by any state on account of sex." congress first introduced the era in 1923, but the campaign for ratification took off in the 1960s during the  civil rightsmovement.