What does "promote the general welfare" mean?

One argument of those who supported the gold standard system in the united states was that the gold standard

Although the women's rights movement had a large impact, no countries currently provide women with: o a. the right to hold the highest offices of government. o b. fair access to the court system. o c. equal representation in the government o d. the right to leave an unhappy or abusive marriage.

How did the united states obtained the purchase of floridia to extand its frontiers to the pacific ocean