"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus
Use money orders.
If this is what I think it is, it won't just affect credit cards. The term "electronic transactions" is vague and could include debit cards, ATM transactions, anything traveling over ACH (including direct deposits and bill payments), and anything traveling over the wires (FedWire, SWIFT, etc). Even inter-account electronic transfers within the same financial institution, as well as gift cards and gift certificates, stored-value cards, and electronic Western Union transfers might be covered. I would have to examine the text of the bill more closely, though, to determine exactly what electronic transactions are covered.
I don't know how the Feds plan to track the trillions of electronic transactions that whiz through our financial computer networks on a daily basis or how they plan to differentiate between transactions conducted solely by U.S. entities. Either way, the cost of business associated with such tracking will be very high and there is the strong possibility that the U.S. Government will intrude on transactions conducted entirely outside the U.S. except for the fact that they are ever so briefly on U.S. financial computer networks.
But yes, as other posters have alluded, I suspect that the purpose of such tracking is to support Internet purchase taxation, as well as monitoring and controlling how much cash citizens can possess and move around freely.