Tolong jelaskan mengenai Historically: dari Kapuloan Britania (istilah) dalam bahasa sunda

The Kingdom of Ireland  was Ireland for the period 1541-1801.

The Irish Republic was a  unilaterally declared 32-county republic encompassing the entire island, during the period 1919-22. During this period, Ireland legally remained part of the UK and its independence was not recognised internationally except by Russia.

Southern Ireland was a  proposed Home Rule 26-county state under the Government of Ireland Act 1920. It never came into practical existence, being superseded by:

The Irish Free State  is Ireland excepting Northern Ireland during the period 1922-37.