Create a timeline which summarises the events mentioned in this text
Explorers have been travelling to the Antarctic since the early 1900s. Shackleton was the first to cross the continent in 1914, but the colonial powers - Argentina, Chile and Great Britain - established their presence there in 1904.
1904 - Argentina, Chile and Great Britain established their presence in the Antarctic.
1914 - Shackleton became the first explorer to cross the Antarctic continent.
Complete the following task based on the instruction and optional input provided.### Instruction:
Create a timeline which summarises the events mentioned in this text

### Input:
Explorers have been travelling to the Antarctic since the early 1900s. Shackleton was the first to cross the continent in 1914, but the colonial powers - Argentina, Chile and Great Britain - established their presence there in 1904.

### Output:
1904 - Argentina, Chile and Great Britain established their presence in the Antarctic.
1914 - Shackleton became the first explorer to cross the Antarctic continent.