What does AMERICAN CLAUSE mean?

AMERICAN CLAUSE meaning in Law Dictionary

In marine insurance coverage. A proviso in an insurance plan towards the effect that, in case there is any subsequent insurance coverage, the Insurer shall nonetheless be answerable when it comes to full extent of amount subscribed by him, without directly to claim share from subsequent underwriters. American Ins. Co. v. Griswold, 14 Wend. (N. Y.) 399.