usher in (verb)

1. The assassination of Archduke Franz Ferdinand in 1914 ushered in the beginning of World War I.

2. In Greek mythology, Prometheus stole fire from the gods and ushered in a new era of knowledge for humanity.

3. The invention of perspective in painting during the Renaissance ushered in a new way of creating depth and realism on canvas.

4. The release of the movie 'Titanic' in 1997 ushered in a wave of romantic films in Hollywood.