US states that have or previously had only one legislative house

Futurist

Ad Honoris
May 2014
21,877
SoCal
What US states were there that have or previously had only one legislative house? I know that Nebraska still has a unicameral legislature even today and that Pennsylvania apparently had a unicameral legislature in Benjamin Franklin's time, but what about any other US states?
 
Jul 2019
592
New Jersey
Pennsylvania (1701 - 1790)
Delaware (1701 - 1776)
Georgia (1777 - 1788)
Vermont (1777 - 1836)

The Articles of Confederation also called for a unicameral Continental Congress.
 
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Futurist

Ad Honoris
May 2014
21,877
SoCal
Pennsylvania (1701 - 1790)
Delaware (1701 - 1776)
Georgia (1777 - 1788)
Vermont (1777 - 1836)

The Articles of Confederation also called for a unicameral Continental Congress.
Were those the only ones?

Also, I wonder what caused these US states to create a second legislative chamber.
 
Jul 2019
592
New Jersey
Were those the only ones?

Also, I wonder what caused these US states to create a second legislative chamber.
With the exception of Nebraska, which went unicameral in 1936, yes.

As a general rule, the Upper House in a legislature (including the House of Lords, the Senate, and the State Senates) were institutions of the upper classes, designed to protect them against a potentially populist House of Representatives. With the exception of Vermont, all of the states adopted a bicameral legislature once their power was firmly established. Vermont, which was very much an anti-elitist state at its inception, insisted on a levelling unicameral system (even as they had a Governor's Council which filled many of the Senate's functions). I don't know why they changed in 1836.
 
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