Avalor does indeed wish to meet with these personages.

The Mexican ambassador, as advertised, is absolutely opposed to the concept of population controls. He spends much of their meeting trying to convince Avalor that instead of abortions uncredited Amentan children could be taken to Mexico and adopted. 

"I don't believe humans are capable of consistently keeping Amentan children in conditions that will be healthy for them."

"It is healthier for them than being murdered!"

"Furthermore, once they grew up, they would each have fifteen children, perhaps slightly fewer if they complied with Mexican law about extramarital sex but perhaps as many as sixty if they failed to season on Earth and no parts of their reproductive systems gave out under the strain."

"We're suffering from world underpopulation, do you really think that's a problem? Children are a blessing."

"If we gave you one hundred children every year, and none of them committed suicide because they could not be confident in the cleanliness of their environment, and they all obeyed Mexican law but married as soon as they sprung and even half of them failed to season - you are I believe near the equator, so that is generous -" She taps some numbers into her calculator app on her everything. "- then before any of them dies of old age you will have more than one hundred billion Amentans."

"Of course, the point is moot because as soon as it looks like you have a runaway population then anyone who's had experience with the Amentan variety of population crisis will either declare war on you en masse, or perhaps find a way to sabotage the door and leave you to sort yourselves out where you can't harm anyone on our planet with this policy, and before that could happen if I announced I was doing this my neighbors would have me assassinated."

The Mexican ambassador attempts to argue in favor of cultivating abstinence but his heart really isn't in it.

"We have invented birth control, Ambassador, preventing the conceptions is not the problem here. At any rate, even if we had reason to believe that Amentans would take very well to Mexican-style abstinent behavior and limit their growth of their own accord in this fashion, I'd consider the policy inhumane. People who have abortions do so because they prefer it to having a baby taken from them and adopted out, not for their entertainment. If in some way you resolve the population management issue perhaps you would do better to apply to the Tapai."

"...what are the Tapai doing?"

"Infanticide. - Is that successfully translating differently than 'abortion' into Spanish? If someone is caught with an uncredited, already born baby in Tapa it is killed."

"Um. Yes. We do have different words for the concepts."

"I see. I do happen to have the Tapai ambassador to Voa on call but the idea is a complete nonstarter if you do not have a way to handle the population control problem."

"I do not think we would likely be able to resolve the population control issue to your satisfaction."

"That's a pity. Thank you very much for meeting with me, Ambassador."

The Canadian ambassador seems much more promising.

"I understand Amentans may be interested in starting a colony in Saskatchewan?"

"I don't think a specific named territory had come up but if it has seasons and empty space and we'll be able to run it with population controls and pollution laws, the answer is yes."

"Saskatchewan has an area of almost five hundred thousand square kilometers and has six hundred thousand residents. The climate is subarctic but it does have summers."

"We'll need to send a test expedition to see if anyone seasons there. A low rate is acceptable, people will just visit to see if they can stay, but if no one can season there it will be unpopular."

"Canada is unfortunately fairly far in the north."

"Reduces the odds but not by much more than your short year length."

"Well, if you don't mind the cold, we actually have several more territories you might be interested in--"

The Canadian ambassador walks Avalor through the geography of Canada. There are not, it turns out, many people in most of Canada. 

"Cold per se isn't a problem, we can live indoors. It's the seasons."

"Living entirely indoors is fairly unpopular among humans-- Canada had a pretty low population for its size even before the infertility crisis."

"This continues to be puzzling but I've come to understand humans don't want children very much."