Angelo's Favourite Invention (Shoes)

Shoe is the piece of clothing that aims to protect the feet. Today, this piece serves as adornment and fashion accessory, and also a social function.
In the XIX century begun to emerge machines to help the confection of shoes, but with the sewing machine are more facilitated and accessible.
In the XX century surge changes in this industry, the leather was exchanged by synthetic materials.

I choose the shoes because all people in the world had ones.