The flag of the United States is one of the nation's most widely recognized symbols. Within the United States, flags are frequently displayed not only on public buildings but on private residences. The flag is a common motif on decals for car windows, and clothing ornaments such as badges and lapel pins.
Ignorance(noun) the condition of being ignorant; the want of knowledge in general, or in relation to a particular subject; the state of being uneducated or uninformed. Ignorance(noun) a willful neglect or refusal to acquire knowledge which one may acquire and it is his duty to have.
An appeal to ignorance is saying something is true or false just because evidence to the contrary is not known. For example, back in the day, people thought the world was flat. We know today that the world is round. But, back in the day, people were ignorant of that fact, so they believed that the world was flat.