What was the most dreaded thing for immigrants on Ellis Island?

The disease most feared was trachoma, a highly contagious eye infection that could lead to blindness and death.

Explanation:

At one time, the average passenger mortality rate was 10 percent per voyage. The conditions were so crowded, so drearily dark, so unsanitary and so foul-smelling, that they were the single most important cause of America's early immigration laws.

Explanation:

i got this from https://hilo.hawaii.edu/news/kekalahea/journey-through-ellis-island-2017#:~:text=At%20one%20time%2C%20the%20average,of%20America's%20early%20immigration%20laws.

the national congress's powers over the states were specific and definite: it had the sole power to negotiate treaties, declare war, and make peace. all powers not granted to congress were reserved for state governments. congress had no power to levy taxes, for example.