Ireland was a pretty different place in 1911. We were under British Rule, yet still managed to have a large Irish speaking population.
This map shows just how many people over the age of 60 actually spoke Irish as their first language, showing that quite a lot of areas had over 90% of the population speaking it every day.
Here's how popular Irish was in pre-famine times
And here's what the Irish population density looks like today
In 2011, only five or so areas have over 90% Irish speaking population.