1) This man wanted a job in America but they weren’t employing Irish men.
2) He wanted to give the employer a black eye and tell him that it is an honor to be an Irish man.
The 1860 Republican National Convention nominated Lincoln, a moderate former Congressman from Illinois, as its standard-bearer. The Republican Party platform promised not to interfere with slavery in the states, but opposed the further extension of slavery into the territories.
One result was that the act doubled the immigrants allowed into the USA, and created a lottery for visas. This helped decrease xenophobia and ease tension. Another noteworthy result of this act was that it removed homosexuality as grounds of exclusion from immigration and/or naturalization.