The border states were still in the Union and the capital of the US is Washington, DC. The American Civil war lasted from 1861 to 1865.
They were border states for the Union and Confederate. Maryland was especially important because it contained the U.S. capital (Washington D.C.)
Sovereignty issues.
They were on the border between the two sections. Their choice of allegiance was crucial to the outcome of the war. That is why Lincoln allowed slavery to continue in those four states - for fear of driving them into the arms of the Confederacy.
Border Princes was created in 2007.
Maryland was critical to the physical safety and protection of Washington, D.C.
Maryland
The State of Maryland. And it was crucial that Maryland didn't seceed, because had that happened, the US Capital would have been completely surrounded by two hostile states: Maryland and Virginia, forcing the Union to choose another Capital City.
Maryland. That was why Lincoln felt it necessary to jail Maryland's pro-Southern leaders without trial (illegal).
The address for the US Customs and Border Protection Agency is 1300 Pennsylvania Ave NW, Washington D.C. 20229. This address for the US Customs and Border Protection Agency is current as of March 2013.
canadad border protection
Idaho borders Washington and Oregon to the East.
Washington's northern border is British Columbia, Canada, eastern border is Idaho, southern border is Oregon and western border is the Pacific Ocean.
Washington has a longer border on the Pacific Ocean.
The Columbia River is the border for most of Oregon/Washington states.
Washington, Nevada, Idaho and California border Oregon.
Oregon, Washington and California border the Pacific Ocean.