Why was the American Federation of Labor's policy of only accepting skilled workers more successful than the National Labor Union or the Knights of Labor?

When it refused, they joined in December 1886 to form the American Federation of Labor (AFL). The new federation marked a break with the past, for it denied to labor reform any further role in the struggles of American workers. In part, the assertion of trade union supremacy stemmed from an undeniable reality. hopes this helps

Explanation:

because the American Federation only accepts workers that can work well in their field, while the regular Unions were avaiñable for anyone, so someone who wasn't qualified from the start could get a job, then whine about unfair labor practices just because they couldn't do the job

the answer is a) the proclamation of 1763.

i also think it is c