Stating that nothing must interfere with the ability of americans "to overspread the continent allotted by providence for the free development of our yearly multiplying millions," new york journalist john l. o'sullivan was describing the concept of

The answer is: manifest destiny

Explanation:

John L. O’Sullivan, Who worked as an editor of a magazine was the first one to use “manifest destiny” in 1845.

This concept stated that America has a right to expand across the whole continent so that they can become more powerful and independent.

i think that the answer is polishing peanuts

martin luther king (1929-1968) was an activist for the african american rights, mr. king has a profile of a kind leader that built a tenacity, respect and full of hope future. he was an activist through civil disobedience and no violence pressure mechanisms. he tried to build a more egalitarian and fair society. his efforts carried a reivindication message of the civilian rights to every west corners. for that reason, he won the nobel prize in 1964.