Vanessa is a lead writer at CNET, reviewing and writing about the latest smartwatches and fitness trackers. She joined the brand first as an on-camera reporter for CNET's Spanish-language site, then ...

Narrator: After World War Two, a 45-year struggle for global supremacy emerged: the Cold War. One side was led by the USA, the other by the Soviet Union - the two superpowers. The Soviet Union led one ...

Learn more about some of the causes of World War One with this activity. Germany was a relatively new country, formed in 1871. They had ambitions to grow an empire to compete with France and the UK.