 Complete the following phrase:  The FA organised the first national tournament when they founded the Football Association Challenge Cup in 1871. At first, the cup was dominated by southern amateur sides, with the cup finals for the first ten years up to 1881 all being contested by teams from various public schools and similar institutions. Within the next two years, however, there had been a complete shift with Blackburn Rovers being the first northern club side to reach the final in 1882. The following year, the cup was won by a predominately working class side, when Blackburn Olympic defeated the Old Etonians. This was the last occasion that a public school side reached the final, and it was not until 1900 that a team from the south of England again reached the Cup Final, when Southampton were defeated by Bury, with Tottenham Hotspur going on to be the first southern professional club to win the cup in the 