Geography influences our life now and it did so in the past. Because of this it helps understand the reasons for some events.
For example geography helps you understand why ancient Greece was composed of many small independent city-states rather than one empire: Greece is composed of many islands and valleys separated by mountains, and it was easy to defend those settlements so they were not conquered by other settlements ( as it was the case in other countries).
The appropriate response is the National Organization for Women. It is the biggest association of women's activist grassroots activists in the United States. Presently has several sections and countless individuals and activists in every one of the 50 states and the District of Columbia.
To be forgiven for past sins. The Pope offered forgiveness for anyone who took part. This was important for knights who had killed many people in battle.
To see the world, have an adventure and prove their bravery.
To get land overseas. This was tempting for a younger son who would not inherit his father's lands.
Serfs, peasants who belonged to their lord, joined the Crusades because the Pope promised them their freedom if they went.
To gain wealth.
Kings encouraged troublesome knights to go on Crusade because it got them out of the country.
