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they were all legally established by the time Illinois was admitted to the union in 1818 but survey & demarcation work continued until 1832 & even today the state line with Michigan within lake Michigan is only approximately established

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12y ago
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15y ago

The western border is the Mississippi River; the southeastern border is the Wabash River; the nothern border is 42.5 degrees north; the eastern border is 87.5 degrees west.

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Q: How were the borders of Illinois formed?
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Related questions

What have southern borders formed entirely by the Ohio river?

Ohio, Indiana & Illinois


What is the capital of a state that borders Illinois?

The capital of Indiana, which is a state that borders Illinois is Indianapolis.


What river borders Illinois on the west?

The Mississippi River borders Illinois on the west.


Why do rivers act as borders?

They are formed as borders because they are formed naturally.


Why do rivers often act as borders?

They are formed as borders because they are formed naturally.


What great lakes border Illinois?

Lake Michigan forms the northeastern border of the State of Illinois.


The three bodies of water that form parts of the borders of Illinois?

Illinois has some body of water on most borders. Three bodies of water that form borders of Illinois are the Mississippi River, Lake Michigan, and The Ohio River.


What borders Indiana to the west?

Illinois


Which country borders Illinois?

Illinois shares land borders with several other US states and one of the Great Lakes, but does not share a border with another country. It is possible, though, to travel by boat from Illinois to Canada.


Is the Mississippi River close to Illinois?

Illinois borders the Mississippi River to the west.


What state borders Indiana to the west?

Indiana borders Lake Michigan to the northwest, Michigan to the north, Ohio to the east, Kentucky to the south and southeast, and Illinois to the west.


Is Illinois on the border of the gulf if Mexico?

Illinois does not border the Gulf of Mexico. Illinois borders Lake Michigan.