Why does the Irish leave Ireland

To escape political and religious persecution and because of famine.

Explanation:

The reasons for the early Irish Immigration to America was to escape political and religious persecution. Although the Irish potato blight receded in 1850, the effects of the famine continued to spur Irish emigration into the 20th century. Still facing poverty and disease, the Irish set out for America where they reunited with relatives who had fled at the height of the famine.