Is a blockade of a port an act of war?

[NYC_SKP]

2. Voted "no" because I believe it depends on the conditions, the details.

If said blockade merely impedes the target's economy, it might not be so bad.

If that blockade, instead, begins to cause suffering and strife and death, then it crosses the line and may become an act of war.

Done well, it can be a warning.

NB, it also depends upon whom is asked the questions; the blockader or the blockadee!