Before Katrina hit, the mayor of New Orleans did what for the very first time in the city's history?

The day before Katrina hit, New Orleans Mayor Ray Nagin issued the city's first-ever mandatory evacuation order.

Explanation:

Because a hurricane is hitting, he takes action to protect his people.

the proximity of water was an advantage to western europe and its culture was able to flourish as a result. trade and travel by sea were easier and safer in historical times.

1. there are no mountains to protect it from the sea

2. and its has wet cool summers and wet, mild winters.