What was a drawback of the u. s bracero program

Need will give brainliest which of the following was the most significant aspect of revel's election to the senate?

What does the quote describe? “the closeness of the place, and the heat of the climate, added to the number in the ship, which was so crowded that each had scarcely room to turn himself, almost suffocated us….the shrieks of the women, and the groans of the dying, rendered the whole a scene of horror almost inconceivable.”

Why have some historians rejected the labels bc and ad as laels for periods in world history