as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
compile a timeline of the important events of the 20th century.
user
the important events of the 20th century include the following:

1900 – world’s first powered flight by the wright brothers
1914–1918 – world war i 
1929–1939 – the great depression 
1939–1945  – world war ii 
1945 – the formation of the united nations 
1962 – the cuban missile crisis 
1969 – the first humans land on the moon 
1989 – the fall of the berlin wall 
1991 – the end of the cold war
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