What does social invisibility mean?

Choose the option that best completes this statement: the british and the continental system were blockades that prevented the united states from trading with without extreme risk to ships, goods, and sailors.

Which of the following was probably the most difficult challenge facing construction of the railroad?

Hich answer supports the statement, "the state constitution is more detailed than the u. s. constitution"? a) the u. s. constitution was created after state constitutions had been established. b) the u. s. constitution only exists because the state constitutions allowed it to be created. c) the articles in the state constitution do not deal with amendments like the u. s. constitution does. d) the articles in the state constitution deal with more specific issues than does the u. s. constitution.