This is actually normal regardless of law enforcerment efforts …
The number of migrant families crossing the border illegally has been falling in recent weeks, according to preliminary figures from U.S. Customs and Border Protection, though U.S. officials say it is too soon to get a full picture of the impact on migration trends from President Trump’s deal with Mexico.
U.S. authorities detained more than 85,000 “family unit” members at the border in May, an average of nearly 2,800 per day. That number has declined about 13 percent since the beginning of June, a period during which Trump threatened to impose tariffs on Mexico and the government of President Andrés Manuel López Obrador agreed to an immigration crackdown to avoid the penalty.
Overall, U.S. officials say they are expecting a decline of 15 to 20 percent decline in border arrests from May, when authorities detained more than 144,000 and migration levels reached their highest point since 2006. The portion of migrants arriving as part of a family group has reached unprecedented levels in recent months, overwhelming U.S. border authorities who say they are ill-equipped to care for so many parents with children….
….Border arrests typically surge in the spring, when demand for U.S. farm labor grows, then subside during peak summer months. Border arrests declined 17 percent from May 2018 to June 2018, an indication that the expected decline this month could follow that same trend….