HELP?! Put these events from least recent to most recent.

River valley civilizations
New stone age
Prehistory
Neolithic revolution
Old stone age

From least recent to most recent:

Prehistory - Prehistory includes all human history before the invention of writing. It includes the Paleolithic, and the stone age.

Old stone age - began about 2.6 million years ago, from the time when humans first started to use stone tools.

New stone age - corresponds to the latter period of the stone age.

Neolithic revolution - The Neolithic revolution began around 10,000 BCE, in the Middle East. It is marked by the invention of agriculture.

River valley civilizations - The first human civilizations are known collectively as the river valley civilizations, because they were settled along major rivers. They are: Sumer (settled along the Tigris and Euphrates), Ancient Egypt (settled along the Nile), Ancient Indus Valley Civilization (settled along the Indus), and Ancient China Civilization (settled along the Yangtse).

to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.