The US flag incorporates and has developed from the Union flag
Mozambique
cactus
manitoba
California
The Maple Leaf and its colors that are similar to the American Flag
The black swan is the bird emblem for Western Australia.
The Canadian Flag is the only national flag with a maple leaf. Though the Grenada flag has a clove of nutmeg on it. Also, the Cyprus flag has olive branches on its flag. And Lebanon features a tree on its flag.
Canada
A variant on the national flag of Peru features the country's coat of arms. This features a cornucopia or horn of plenty spilling coins to indicate the mineral resources of Peru.
The Saltire and the St. Andrew's Cross are two names for the flag of Scotland. It features a white diagonal cross on a blue field.
The flag of the People's Republic of China is red. The flag features five yellow stars in the upper left corner with the left star larger than the other four.