Old and Middle Kingdom in Ancient Egypt

This Old Kingdom pharaoh created the first step pyramid:

How did Menes die?

Upper Egypt's Crown was white:

When did the Middle Kingdom start?

What was the significance of Sneferu?

What was the capital city of Egypt?

Who built the Great Pyramids of Giza?

Imhotep was Menes' architect.

Why did the Old Kingdom collapse?

What was the Nile used for?

In the Middle Kingdom, what country (modern day Sudan) expanded into Europe? 

The Bent Pyramid is bent because Sneferu wanted to create new architectural style.

Which of these pyramids were the last to be built?