The most significant obstacle in building the transcontinental railroad was
a) crossing the appalachian mountains.
b) laying track across the great plains.
c) removing hostile native americans from the region.
d) crossing the sierra nevada range and the rocky mountains.

a.) d-day invasion of normandy.

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depends on the age of the teen, many believe by the age of 16 a person should know the strong difference between right and wrong along with the difference between risky and immediate death. swimming with sharks might be dangerous but swimming with sharks while bloody meat is attached to you is just insane. even more if you have no idea what you're doing. however, no matter the age, as long as the person is skilled enough and has the mental and physical capacity to control their actions doing whatever sport they put their mind to is all that matters.

a because the britsh thought the ameracans were trators so a

false articles of confederation, ultimately building a new government and new constitution with an executive, legislative, and judicial branch and a system of checks and balances.