With the decline of Rome, there was no one to stop the advancement of the warring Germanic tribes. These tribes travelled in search of food, wealth, and shelter, and often left devastation behind them.
The result was that civilized life saw a long period of decline. Building slowed down, bridges and roads fell into serious decline and disuse.
The lack of trade seriously hurt the local economies of Europe. Additionally, during this time period there was a general decline in education.
This time period has come to be known as the Dark Ages, or Medieval times.