The answer is actually Complex drainage systems to keep structures from flooding.
Isolation to an island--The Anglican Church or the Church of England remained on the island nation due to geographic isolation.
The Anglican Church had the king/queen of England as the leadership of the Church. Becoming a member of the church would also create loyalty to the British royalty. In addition, the Church become one with the traditions of the monarchy in Britain and did not connect to other areas.
They lived in large houses with tile roofs, courtyards, and gardens. Fine furniture and silk hangings filled their rooms, and their houses were surrounded by walls to keep out bandits.
There are several ways in which the Chinese government reacted to demands for democratic reform, but most of them were violent suppressions of protests.
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