As europe came under attack from multiple invading groups during the middle ages, which group launched the most devastating attacks across the continent?

The Vikings

Explanation:

The Vikings were Scandinavians and between the 8th and 11th century of the middle ages (5th to 15th century) raided most part of Europe causing much devastation in the continent.

1. state-issued photo ids. provide them for free for those who can't afford them.

2. the system we have seems to be working nearly perfectly. seems like about 31 cases per billion votes cast

3. the national policy for hiring new employees which requires proof of eligibility to work. there are something like 20 types of identification which can be used for this.

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )