"The Constitution provides that an amendment may be proposed either by the Congress with a two-thirds majority vote in both the House of Representatives and the Senate or by a constitutional convention called for by two-thirds of the State legislatures."
https://www.archives.gov/federal-register/constitution
"A proposed amendment becomes part of the Constitution as soon as it is ratified by three-fourths of the States (38 of 50 States)."
Anyone know a site that can tell you how many state legislatures are controlled by which party? 2/3 to propose, but 3/4 to pass. Seems pretty high.