アメリカ連合国には何州が加盟していましたか？
The first official flag of the Confederate States of America – called the "Stars and Bars" – originally had seven stars, representing the first seven states that initially formed the Confederacy. As more states joined, more stars were added, until the total was 13 (two stars were added for the divided states of Kentucky and Missouri). During the First Battle of Bull Run, (First Manassas) it sometimes proved difficult to distinguish the Stars and Bars from the Union flag. To rectify the situation, a separate "Battle Flag" was designed for use by troops in the field. Also known as the "Southern Cross", many variations sprang from the original square configuration. Although it was never officially adopted by the Confederate government, the popularity of the Southern Cross among both soldiers and the civilian population was a primary reason why it was made the main color feature when a new national flag was adopted in 1863. This new standard – known as the "Stainless Banner" – consisted of a lengthened white field area with a Battle Flag canton. This flag too had its problems when used in military operations as, on a windless day, it could easily be mistaken for a flag of truce or surrender. Thus, in 1865, a modified version of the Stainless Banner was adopted. This final national flag of the Confederacy kept the Battle Flag canton, but shortened the white field and added a vertical red bar to the fly end.
13