The reason for this is that the Industrial Revolution was intensifying and changing the lives of workers all over Europe. By the middle of the 19th century, the Industrial Revolution had taken hold all over Europe. This lead to a negative impacts on the lives of workers. Workers lost their control over when and how hard they worked. Instead, they worked when and how their bosses told them to. Increasingly, the bosses and factory owners got the lion's share of the wealth created in the factories. Because of these changes, Marx and Engels were inspired to write The Communist Manifestoin an effort to promote a system that, they thought, would treat the workers more justly.