What hardship did both central pacific and union pacific workers face? (a)attacks from american indians (b)blasting through the sierra nevada (c)extreme weather conditions (d)losing workers to the gold rush

Extreme weather conditions.

The Central Pacific Railroad was a cargo and passenger train company that had operations between California and Utah in the 1860s.  

The Union Pacific Railroad is a similar company set up in 1862, that has country wide operations covering Chicago, Illinois to the Pacific coast. The Central Pacific Railroad, later on became part of the Union Pacific

c. extreme weather conditions

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.

hr2520 is the patient's act. there is required the secretary of health to summon a committee to develop a national strategic plan of prevention. this committee has forth provisions that make possible for the govern entities to acquire private health insurance services.

is easier to keep this hr2520 as federal, because that way the secretary of health has centralized power to deal with private insurance companies and the federas government has more ways and power to negotiate with them, than doing this process state by state in their specific terms.