Globalisation began in the 19th century, with the Industrial Revolution and the development of railways and larger ships meant trade and transport boomed during this time because products could be more easily and cheaply transported around the world.
In the 20th century, the development of aeroplanes and containerisation shipping progressed this further.
The 21st century is defined by its technological advances and interconnectivity due to developments in ICT, the internet, social media, etc, and has made worldwide communication significantly easier.