Avalid treaty between the united states and a foreign country provides for the elimination of all tariff barriers between the two countries. it authorizes the president of either country to issue a proclamation nullifying any state or local laws in that country that have the effect of impeding imports from the other country. the foreign country uses the metric system of measurement, and thus all goods produced there and exported to the united states are packaged in metric sizes, such as liters and kilograms. a law of a state in the united states requires all goods sold in that state to be packaged in traditional american sizes, such as quarts or pounds. because the state law substantially impedes imports from the foreign country, the president of the united states has issued a proclamation nullifying the state law pursuant to the treaty. is the president’s proclamation valid?

Yes, it is valid.

Explanation:

Article VI of the U.S. Constitution establishes that the Constitution, federal laws and treaties made should be considered "the supreme law of the land" (the highest law), and therefore, all states should be bound by them and no state law can take precedence over the most supreme authority.

Therefore, a valid treaty, that is to say, a constitutional treaty, is superior to any law that states may create, and since the state law substantially impedes imports from the foreign country that was agreed in the treaty, the President's proclamation nullifying the state law pursuant to the treaty is completely valid.

answer; i do believe that the correct answer is (punch card ballots);

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place