What problems did early trade unions face?

Which of the following discoveries would be most likely to cause a scientific paradigm shift? a. the discovery of more rings around uranus b. the discovery of a new pathogenic virus transmitted by mosquitoes c. the discovery that a dormant volcano is showing signs of activity d. the discovery of a new species of salamander in the amazon rainforest e. the discovery that excess heat is radiating from the center of the earth and causing global climate change

Why did lincoln inform the confederacy that he would not e sending troops or weapons as food supplies were sent to fort sumter?

The american public was excited by the invention of the railroad system. true false