In its approach to union organization, the Knights of Labor officially?:

correct sequence:

a) soviet leader nikita khrushchev denied the existence of missiles in cuba.   (already in september, 1962, khrushchev warned the us against attacking any supply ships the ussr brought into cuba and denied the presence of any offensive weapons.)

c) a us reconnaissance plane discovered missiles being installed in cuba.   (the discovery was made october 15, 1962.)

e) us president john f. kennedy ordered the us navy to form a barrier around cuba.

f) us president john f. kennedy demanded an end of the secret operation.   (in an october 22, 1962, speech, kennedy announced to the nation the naval blockade he had ordered and announced to the soviet union his demand that they stop their operation and remove their missiles.)

d) us president john f. kennedy promised to not invade cuba and to dismantle us   missiles that were installed in turkey.

b) soviet leader nikita khrushchev offered to dismantle the missiles in cuba in exchange   for certain promises from the united states.

the cuban missile crisis was a tense face-off between america, led by president john f. kennedy and the soviet union, led by nikita khrushchev, in october of 1962, over the placement of soviet missiles on the island of cuba, close to the united states home territory.   it is often stated that this moment was the closest the usa and the ussr ever came to the eruption of an actual nuclear war between the two superpowers.

answer: secession

secession, as it applies to the outbreak of the american civil war, comprises the series of events that began on december 20, 1860, and extended through june 8 of the next year when eleven states in the lower and upper south severed their ties with the union. the first seven seceding states of the lower south set up a provisional government at montgomery, alabama. after hostilities began at fort sumter in charleston harbor on april 12, 1861, the border states of virginia, arkansas, tennessee, and north carolina joined the new government, which then moved its capital to richmond, virginia. the union was thus divided approximately on geographic lines. twenty-one northern and border states retained the style and title of the united states, while the eleven slave states adopted the nomenclature of the confederate states of america.

explanation:

sonar maybe? ? i dont know the choices