Joseph McKenna, Carondelet Canal Navigation Company v…
“ If it was the assertion of legislative power against the contract of the company, and a legislative provision against the obligation of the contract, and was an essential, although unmentioned, element of the decision under review, it is a basis in the Federal question set up. Nor need bad motives be imputed to the legislature. It is not the motive which caused the enactment of the law which is of account, but the effect of the enactment, impairing the rights resting in the contract. And this, we think, was the effect of the act of 1906. ”
