Query: in wat year did  ireland join with great britian offically?
Context: With the Acts of Union 1707, the canton was updated to be the new Union Flag—consisting of an English St George's Cross combined with a Scottish St Andrew's cross—representing the Kingdom of Great Britain. After the Acts of Union 1800 that joined Ireland with Great Britain to form the United Kingdom, the canton of the East India Company flag was altered accordingly to include a Saint Patrick's Saltire replicating the updated Union Flag representing the United Kingdom of Great Britain and Ireland.