语法分析:they were signing a promissory note to which .....
they were signing a promissory note to which every American was to fall heir.
请问 to which ... to fall heir是一个什么样的用法?
参考答案:定语从句。
转换成陈述句的话,应该为:
They were signing a promissory note and every American was to fall heir to this note.