Absolutely not because this would mean we'd not work with International countries and many other things. Look up the definition of Isolationism and come up with your own answer in your own words because it's asking you to provide your own opinion
There are no choices here but the reason why it is the duty
of the state government to protect public health is because it starts at the
grass-roots level where municipalities as well as city and state officials are
the ones responsible for directly monitoring and implementing preventive
measures to stop the spread of diseases.
President Polk wanted California but knew Mexico would not agree to sell it and his only avenue was to start a war (knowing the US would win it).
Manifest Destiny, or the belief that it was American's God-Given-Right/ responsibility to expand the United States boarders from the Atlantic to the Pacific. People moved west because there was rich land for farming, opportunities for business or self advancement.