Article V explains the amendment process, which is different and more difficult than the process for making laws. When two-thirds of the Senate and two-thirds of the House of Representatives vote to change the Constitution, an amendment goes to the state legislatures for a vote.
Another way to use the fridge for brief cold stratification is to plant the seeds in individual jiffy pellets and put them in either a plastic covered container (such as for home baking little bread loaves) or in a store-bought greenhouse flat. Depends on how much room you have in your fridge.
Magnolia stellata needs a cold period (at least 2 to 3 months) for germination. I sow freshly cleaned seed in rounds (multiple seeds per pot) and place in a critter-proof frame outdoors (chipmunks, squirrels, and other animals love to eat the seed and/or dig through the rounds to bury their nuts).