Which statement best explains why the transcontinental railroad took several years to build? digging through mountains was difficult, and harsh weather slowed progress. several civil war battles took place nearby and kept work from progressing. congress fought over funding for the railroad, leading to work stoppages. immigrants were not interested in railroad work, which made it hard to fill jobs.

Digging through the mountains was very difficult, and the long winters hampered workers' ability to make progress.

Digging through mountains was difficult, and harsh weather slowed progress.

Explanation:

The cross-country railrold took quite a while to build because burrowing through the mountains was troublesome, and the long winters hampered worker's ability to gain ground. The lower regions of Sierra Nevada, the winter snowtorms, lack of solid work and expanding requirement for burrowing hampered the advancement as they went higher in the mountains.

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to generate donations

to organize supporters

to solicit support

congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.