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Legislature should only be capitalized when it is part of a title such as Ohio Legislature or the National Conference of State Legislatures.
They were selected by national legislatures
The National Conference of State Legislators keep track of this and a lot more: http://www.ncsl.org/programs/legismgt/about/legislator_overview.htm
National Conference of Commissioners on Uniform State Laws was created in 1892.
a National Convetion