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I am working with a shapefile layer of the world. All the countries are in the Attribute table each one in a different row. I tried to make each polygon in a different color so the countries will be in a different color, but it did not work.enter image description here

In the Africa map I save each polygon separately and upload into a new QGIS. This method takes a lot of time. What would a better and faster method be?

enter image description here

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    While it's possible to generate 260+ discrete colors, the ability to distinguish the differences is highly questionable, even among a population without color-blind individuals. You might benefit from research into the four color theorem and reading the QGIS documentation on thematic mapping. – Vince May 20 '17 at 11:57
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You may right-click on the layer in the Layers Panel and go to Properties >> Style dialog.

Then, choose Categorized, set the field that stores the name of the countries and click the Classify button:

enter image description here

Finally, click the Apply button for applying the changes and you will see this:

enter image description here

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    Good one! Didn't know this feature – Adam Matan May 25 '17 at 17:32
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    @AdamMatan, really easy to use, but very effective at the same time! – mgri May 25 '17 at 17:55

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