The peaceful introduction of Islam in the early medieval era of Somalia's history brought Islamic architectural influences from Arabia and Persia. This had the effect of stimulating a shift in construction from drystone and other related materials to coral stone, sundried bricks, and the widespread use of limestone in Somali architecture. Many of the new architectural designs, such as mosques, were built on the ruins of older structures. This practice would continue over and over again throughout the following centuries.
Along with sundried bricks and coral stone, what construction material was widely used after the introduction of Islam?
limestone

Rawski writes that Altan Khan's conversion to the Gelug "can be interpreted as an attempt to expand his authority in his conflict with his nominal superior, Tumen Khan." To further cement the Mongol-Tibetan alliance, the great-grandson of Altan Khanthe 4th Dalai Lama (15891616)was made the fourth Dalai Lama. In 1642, the 5th Dalai Lama (16171682) became the first to wield effective political control over Tibet.
When did the 5th Dalai Lama gain political control over Tibet?
In 1642

In the 1950s, the Ethiopian feudal administration under Emperor Haile Selassie sought to annex Eritrea and Italian Somaliland. He laid claim to both territories in a letter to Franklin D. Roosevelt at the Paris Peace Conference and at the First Session of the United Nations. In the United Nations, the debate over the fate of the former Italian colonies continued. The British and Americans preferred to cede all of Eritrea except the Western province to the Ethiopians as a reward for their support during World War II. The Independence Bloc of Eritrean parties consistently requested from the UN General Assembly that a referendum be held immediately to settle the Eritrean question of sovereignty.
Who did Ethiopians support in World War II?
The British and Americans