A text that describes events in the order they happened is structured according to

Texts that tell events in the order that they happened is structured according to chronological order.

Chronological has its roots from the Greek word chronos which means "time". Words such as chronic disorder, anachronism, and chronicle all share the same root word and its meaning has also something to do with time.

Thus, chronological simply means to tell the events in the correct order in which they happen according to time.

A text that describes events in the order they happened is structured according to chronological order. Chronological order is, as you might have guessed, the order in which events occur, and is the typical format for stories and informational texts.