a long barrier is something that gymnastics jump over
the pacific ocean
If you're referring to the barrier that separated communist countries in Europe from non-communist countries, the answer is the Berlin Wall.
barbed wire
confirmation bias
mountains
The Apalachian Mountains
The Rocky Mountains served as a natural barrier to westward expansion in North America. This rugged mountain range made it difficult for settlers and explorers to cross as they moved toward the Pacific coast.
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The Rocky Mountains and the Appalachian Mountains have influenced migration patterns in America. The Rocky Mountains acted as a natural barrier to westward expansion, while the Appalachian Mountains presented a barrier to early settlers moving westward from the eastern colonies.
The Sahara Desert on both sides of Egypt served as a natural barrier to invaders from outside and expansion from inside outward.
The Sahara Desert on both sides of Egypt served as a natural barrier to invaders from outside and expansion from inside outward.
The Sahara Desert on both sides of Egypt served as a natural barrier to invaders from outside and expansion from inside outward.
The Sahara Desert on both sides of Egypt served as a natural barrier to invaders from outside and expansion from inside outward.
The Sahara Desert on both sides of Egypt served as a natural barrier to invaders from outside and expansion from inside outward.
The Appalachian Mountains.A wall of Mountains The 1,500-mile- long Appalachian Mountain range formed a natural barrier to westward expansion.
The Appalachian Mountains.A wall of Mountains The 1,500-mile- long Appalachian Mountain range formed a natural barrier to westward expansion.