Interactive Chronology Tool
Build history year by year.
Click a year, then use the side panel to add the most essential historical layers. This version focuses on the 1700s, 1800s, 1900s, and 2000s, with cleaner categories and overlapping historical spans.
20th Century Grid
Each square is a year. Colored dots show category layers saved inside that year. Transparent bands show long developments like wars, movements, or scientific eras stretching across multiple years.