How Communication Has Changed

• 1Letters were one of the main ways to communicate in the past.
• 2The telephone was invented in the 1800s.
• 3Today, we can send messages with just a click.

1. 1844

   Samuel Morse sends a long-distance telegraph message

2. 1876

   The telephone is invented

3. 1920

   KDKA in Pittsburgh begins regular radio broadcasts

1. 1973

   Martin Cooper makes the first call on a handheld cell phone