True are false an association of all workers in given industry is called trade union

True.  When a group of workers in a certain industry band together, they form a union.  This way they will be able to gain a voice where they can express their feelings and views on issues affecting their performance at the workplace. They protect the rights of workers and strive to improve worker conditions.

b.

jim crow laws were enacted in northern states.

your answer would be (b)