When an amendment is ratified by 3/4 of congress or by 3/4 of state legislatures it becomes part of the federal constitution and all states even those that did not ratify the amendment must follow the laws in the new amendment to

This is true.

According to the National Archives "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."

So, this provides for a Federal and a State option for passing amendments. If it passes by either means, it is binding for the entirety of the county and not just those that passed it.

The statement is true

Explanation:

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

the answer is