Final answer:
The question asks for the number of IBEW international vice-presidential districts in North America, but the provided context about the 1860 election electoral map is unrelated. The exact number can be found by checking the latest IBEW organizational structure or contacting the union directly.
Step-by-step explanation:
The International Brotherhood of Electrical Workers (IBEW) is divided into several international vice-presidential districts in North America, although the exact number is not explicitly provided in the context given.
To determine the current number of IBEW vice-presidential districts, one would typically look at the most recent organizational structure or contact the IBEW directly. The information provided in the context, referring to the map showing the disposition of electoral votes for the election of 1860, does not relate directly to the IBEW or its district divisions.